means A journey through or around a place — often for sightseeing, performance, or duty — that typically returns to where it began.

from From Old French 'tour' meaning a turn or circuit, from Latin 'tornus,' a lathe (the tool that spins wood into round shapes), itself borrowed from Greek 'tornos,' a carpenter's tool for drawing circles. So the word literally carries a turning, a coming-back-around, baked into its root — a cousin of 'turn' and 'tornado.'